O16 CHARLES PauL ALEXANDER 
slender points. Antenna short in both sexes: Pronotal breathing horns (Plate L, 238 
moderately elongate, cylindrical, transversely wrinkled, at tips smooth, flattened, an 
slightly enlarged. A tubercle with two long setae above wing axil. Two setiferous puncture: 
on dorsum on either side of median line. Wing sheaths ending before tip of second abdomina 
segment. Leg sheaths ending before tip of third abdominal segment, the tarsal sheath 
ending about on a level or the hind legs shorter. 
Abdominal segments with tergites (Plate L, 239) 2 to 6 provided with eight naked 
discal tubercles, arranged in four transverse pairs, the third pair more approximated; latera 
of third pair of naked tubercles, two small setiferous tubercles; on seventh segment one of th 
four pairs of tubercles lacking; near caudal margin of segments a transverse row of weak 
setiferous tubercles; on either side of median line, in alinement with discal tubercles an 
just anterior to the transverse setiferous row, a large tubercle provided with three setae 
Pleural region carinate, each segment armed with feur slightly curved tubercles: anterio 
one solitary, setiferous; second one solitary, naked; third one with two cr three setae; posterio 
one bifid, naked. Sternites (Plate L, 240) with six naked, discal tubercles correspondin 
to those of tergites but reduced in number. Subterminal armature weak, ends of row. 
tuberculate; an isolated setiferous tubercle ventrad and laterad of ends of rows. Mal 
cauda (Piate L, 242) elongate; dorsal lobes elongate-cylindrical, directed caudad an 
slightly dorsa1, tapering to acute tips; three weak setae on outer ventral face; ventral lobe 
blunt, much shorter than dorsal lebes, with a blunt median lobule between them at thei 
base; eighth segment cn tergum provided with a large, blunt, median tubercle, with tw 
large posterior lobes which are directed caudad and with two tiny lobes on either side i 
front; sternum with a transverse row of four separated setiferous tubercles; caudal margi 
with a transverse row of about eight or nine pale tubercles on either side, the outermost th 
largest; a small seta above second tubercle at ends of row. Female cauda (Plate L 
241) very long and slender, subacicular, sternal valves a little shorter than tergal valves 
tergal valves terminating in blunt cylindrical points. 
Neanotype-— Male pupal skin, Ithaca, New York, June 3, 1917. 
Paratypes.— Pupa, a male skin with type pupa; a female skin, Ithaca. 
Subtribe Hexatomaria 
The subtribe Hexatomaria comprises a well-defined division with bu 
four known genera, three of which are North American and are considere 
in this paper. The only other group of crane-flies with which the specie 
may be confused are certain of the Limnophilaria, especially the Ulomorph 
group of genera. 
The larvae have the labral sclerite of the head capsule large, separate 
from the remainder of the capsule by a distinct suture. The epipharyngea 
region is restricted to the anterior median part of the sclerite, and is pro 
vided with two large tubercles on either side, which are tipped with tw 
or *hree hyaline, cylindrical papillae. Between these papillae is a brus 
